DataVXACS Energy LettersPaper
journal article·2019-05-10Open access

Identifying and Reducing Interfacial Losses to Enhance Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet Light-Emitting Diodes

Robert L. Z. Hoye, May-Ling Lai, Miguel Anaya, Yu Tong, Krzysztof Gałkowski, Tiarnan Doherty, Weiwei Li, Tahmida N. Huq, Sebastian Mackowski, Lakshminarayana Polavarapu, Jochen Feldmann, Judith L. MacManus-Driscoll, Richard H. Friend, Alexander S. Urban, Samuel D. Stranks

ACS Energy Letters· Volume 4· Issue 5
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Source abstract

Abstract

Perovskite nanoplatelets (NPls) hold promise for light-emitting applications, having achieved photoluminescence quantum efficiencies approaching unity in the blue wavelength range, where other metal-halide perovskites have typically been ineffective. However, the external quantum efficiencies (EQEs) of blue-emitting NPl light-emitting diodes (LEDs) have reached only 0.12%. In this work, we show that NPl LEDs are primarily limited by a poor electronic interface between the emitter and hole injector. We show that the NPls have remarkably deep ionization potentials (≥6.5 eV), leading to large barriers for hole injection, as well as substantial nonradiative decay at the NPl/hole-injector interface. We find that an effective way to reduce these nonradiative losses is by using poly(triarylamine) interlayers, which lead to an increase in the EQE of the blue (464 nm emission wavelength) and sky-blue (489 nm emission wavelength) LEDs to 0.3% and 0.55%, respectively. Our work also identifies the key challenges for further efficiency increases.
Source: openalex_inverted_index · Quality: baseline

Research context

NanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, U.K.

Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K.

Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstraße 10, 80539 Munich, Germany

Nanosystems Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstraße 4, 80799 Munich, Germany

Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, 5th Grudziadzka St., 87−100 Toruń, Poland

Nanospectroscopy Group, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstraße 10, 80539 Munich, Germany

Funding

Royal Academy of Engineering · Ministerstwo Nauki i Szkolnictwa Wyzszego · Magdalene College, University of Cambridge · Engineering and Physical Sciences Research Council · Royal Society · Deutsche Forschungsgemeinschaft · Bayerisches Staatsministerium f?r Wissenschaft, Forschung und Kunst · H2020 European Research Council · National University of Ireland · Isaac Newton Trust

References (35)

Show source-provided references
1. 10.1002/adma.20180333610.1002/adma.201803336 ↗
2. 10.1016/j.joule.2017.08.00610.1016/j.joule.2017.08.006 ↗
3. 10.1038/ncomms1394110.1038/ncomms13941 ↗
4. 10.1038/nature2598910.1038/nature25989 ↗
5. 10.1126/science.124398210.1126/science.1243982 ↗
6. 10.1039/C8EE00124C10.1039/C8EE00124C ↗
7. 10.1021/acs.chemmater.6b0549610.1021/acs.chemmater.6b05496 ↗
8. 10.1002/adma.20170217610.1002/adma.201702176 ↗
9. 10.1039/C8EE01936C10.1039/C8EE01936C ↗
10. 10.1021/acs.nanolett.5b0236910.1021/acs.nanolett.5b02369 ↗
11. 10.1021/acs.nanolett.7b0154410.1021/acs.nanolett.7b01544 ↗
12. 10.1038/s41566-018-0283-410.1038/s41566-018-0283-4 ↗
13. 10.1016/j.joule.2018.08.00510.1016/j.joule.2018.08.005 ↗
14. 10.1002/adma.20170622610.1002/adma.201706226 ↗
15. 10.1038/s41586-018-0575-310.1038/s41586-018-0575-3 ↗
16. 10.1021/acsenergylett.8b0102510.1021/acsenergylett.8b01025 ↗
17. 10.1364/OE.22.01906910.1364/OE.22.019069 ↗
18. Bohn B. J. · Nano Lett. · 2018 · 18 · 523110.1021/acs.nanolett.8b02190 ↗
19. 10.1021/acs.nanolett.8b0219010.1021/acs.nanolett.8b02190 ↗
20. 10.1021/acsphotonics.6b0096310.1021/acsphotonics.6b00963 ↗
21. 10.1016/j.nanoen.2018.03.01910.1016/j.nanoen.2018.03.019 ↗
22. 10.1021/acsenergylett.8b0210010.1021/acsenergylett.8b02100 ↗
23. 10.1021/acsenergylett.7b0038310.1021/acsenergylett.7b00383 ↗
24. 10.1021/acs.chemrev.8b0064410.1021/acs.chemrev.8b00644 ↗
25. 10.1002/adma.1997009030810.1002/adma.19970090308 ↗
26. 10.1021/acs.jpclett.6b0094610.1021/acs.jpclett.6b00946 ↗
27. 10.1021/acs.chemmater.6b0385210.1021/acs.chemmater.6b03852 ↗
28. 10.1021/nn500897c10.1021/nn500897c ↗
29. 10.1002/1521-4095(20020705)14:13/14<975::AID-ADMA975>3.0.CO;2-D10.1002/1521-4095(20020705)14:13/14<975::AID-ADMA975>3.0.CO;2-D ↗
30. 10.1002/adma.20140504410.1002/adma.201405044 ↗
31. 10.1038/nphoton.2011.17110.1038/nphoton.2011.171 ↗
32. 10.1038/nphoton.2015.3610.1038/nphoton.2015.36 ↗
33. 10.1038/nphoton.2013.34110.1038/nphoton.2013.341 ↗
34. 10.1038/srep4572610.1038/srep45726 ↗
35. 10.1021/acsenergylett.6b0071910.1021/acsenergylett.6b00719 ↗